Grease fitting



' J. J. SMITH Sept; 27, 1932.

GREASE FITTING Filed May 51, 1950 llllfiillll l l IN VEN TOR (/fl77766 1157723269,

. B v @iz QM ATTORNEY f Some ofthe objects ofthe present invention Patented Sept. 27,1932

enses amass. sivirrn; oF'rHrLAnnLrHIA, rENNsvLvANrA, ASSIGNOR, :BY MESNE AssIGN- F MnNrsmo ENDURABLE rnonuors co, 1 c., or-1 n1LnDE PnIA, PENNSYLVANIA, A

i eonronATmN bF' E AW GREASE.

' Application filed Mays31,

1 to lubricating devices in general, but more especially to fittings'for use with lubricant supply guns operating under relatively high pressures.

jjln fittings now in general use and'as here before employed it"has' been the practice to permanently attach. valve controlled inlet nipples to bearings so that any bearinglrequiringrlubrication can receive the same the attachment of a so-called gun supplying lubricant under pressure. The valves of these nipples. are o'f t-he direct acting type employing a ball which is held seated overthe valve inlet by a coilspring and these serve fairly eifectivel'y where light oils are concerned and. introduced under relatively low pres sures, Where, however, the lubricant is in the form of grease which requires pressures I running into thousands ofpounds to expel thefgreasefroin the gun. to the bearing this pressurenot only forces the ball valverfro n its seat but jams itlinto thecoils of the spring sojthat the. latter is expanded tobite into the walls of the passage thereby entirely preventing passage of grease through the nipple I and also holdingthe valve so thatit cannot again return to its seat." As a result fittings of. this character are rendered useless and be rings are burnt out by failure of the grease passthrough thenipple.

" a e to provide. animproved valve controlled nipple and its cooperating chuck; to provide fa nipple wherein supplied; lubricant always 35 passes through the nipple "to the bearing lEd ess of theveonsistency of the gre s d i ofthe applied pressure toprovide a pressure gun chuck which coacts with the nipple. in sucharway as to prevent the collection. of

hardened grease about the inlet of the nipple and to remove dirt and collected sediment fromthe vicinity of the saidinlet; to provide when the parts are connected together for operation to providea spring control for the valve of a lubricating nipple wherein the spring is always effective to maintain the inlet of thenipple closed when the lattenisnot other improvements as willhereinafter appear. I

.. In the: accompanying drawing Fig. 1 rep resents a longitudinal section of a nipple and chuokin disconnected alined relation showing one form of the present invention; Fig. 2 represents a section on line 22 of Fi 15 Fig. 3 representsa perspective of one orm of wiping device for maintaining a lubricating nipple free from dirt and grease; Fig. 4 represents a detail in front elevation of the chuck; Fig. 5 represents a section of a nipple embodying another form of the-invention; Fig.- 6v representsa perspective of the spring employed with the-form of invention shown in Fig. 5;. and .Fig. 7 represents a section of a nipple embodying another form of the invent-ion. Referring to the drawing and particularly to'Fig. 1 a valve controlled inlet nipple pin 10 shown disconnected from but in alined relation With its cooperating chuck 1 1 which latter, is of tubular form and internally threaded as shown at 12 for attachment to the discharge end of a grease gunof the pres sure operated type. As here shown the nipple lOhas a longitudinally disposed passage 13 therein whichisl rectangular in cross section and is in communication with theinlet port 14 of the nipple-at one end while its other end is open for communication with the-passage leading tothegbearing to be lubricated. .This'nipple differs from the ordinary typeof nipple used in such lubricating sys tems in that the end which enters the chuck 11 is closed and the side inlet 14 serves as a means for admitting the grease to the this -inlet and 'to prevent. the, collection oil.

dirt therein a" plug 18 is attached to the spring in alinement with the inlet 14 and is normally held in such inlet sealing 1t greater distance apart than the width ofthe' passage '18 and thereforewhen the spring is in place the legs of the spring are held out wardly pressed against twoopposite sides of the passage 13 and serve as an additional tive position. When the lubricant enters-the inlet 14 under theapplied pressure the plug 18 is forced'back to fully open the inlet 14 and the lubricant then rides along the face of one leg oft-he spring to force it away from the'wall of'the nipple and thereby giving free passage for the'l'ubricant to enter I the channel leading to the bearing; Since the width of the spring is substantially the same as the width of the passage 13' there is no danger that the spring will move relativeto the nipple and cause disalinement of the plug with the inlet port 14. V 1

The end by which the nipple 10 is attached toa bearing is externally threaded for attachment of the part while intermediate its ends are two oppositely disposed lugs 1 20 which form parts of a-bayonet joint aswill be understood. The cooperating'partsof the bayonet joint are the cross slot 21 in the end of the chuck 11 and circumferential grooves" In bringing the nipple 10 to assembled rela 7 tion withthe chuck 11, the chuck ll'is moved over the closed end of the nipple 10 so that the latter'p'asses' snugly through the axial opening 23 of the chuck into'the enlarged bore 24. The annular wall 25 encircling: the

opening 23. forms an abutment which seats a' metallic wiper 26 and. a 'packing ring. 27,; the

last two elements being held in place by the cooperating end of the gun hose which is" threaded into the'bore 24; The wiper 26 is of annular .iormhaving a hole 28 of a diameter minutely greater than theouteridiameterof the entering part of the' nipple 1 0 entering the bearing.- The ring 27, is of a compressible type and serves to seal .the joint between'the parts and prevent leakage.

In the form of the invention shown in Fig. 5,. a nipple 10: is shown wherein thebody of May, 1930 with the spring 31 held firrnly over theinlet port 14; The plug is secured to the spring 31 so that it enters the port 14 as a closure means.

The form ofthe'invention shownin- Fig. 7difl'ers from that ofFig. 5 in that a unitary hook-'shaped-flat spring 33 is used in the passage 30 and has one end anchored. in asplit 'lug 34 .at one side of thenipple, while the bow or hook portion servesunder, the compressed action,to hold the plug in place and to closethe port 14. 'means foranchoring the spring in 1ts opera- Havingthus described my invention, I

cantnipple having an inlet port in thefside' thereof and a long'itudinallydisposed passage communicating with said port to form a discharge outlet ffrom said nipple a. U-

discharge channel under operating condishapedi spring compressed within said -pas- $5 sage and abutting both sides thereof to close tions, and a plug secured to said spring to fit within said port.

2. As a new-article of manufacture a lubricant nipple having an inlet port in the sidev thereof and a longitudinally disposed passage communicating with said port to form a discharge outlet from said. nipple, and a. fiatstrip spring held'under compression in'said passage to close said inlet under nonoperating conditions but yieldable" under pressure to bodilymove'away'from one side of said passage to open said inlet under op,- erating conditions. Y r V "3. Asa new article of manufacture a lubri cant nipple havin-g aninlet port in he side thereof and a longitudinally disposed passage communicating with said port to form a discharge outlet from said nipple, said passagebeing square'in cross section, and a Hat strip spring fitting said passage and. looped under compression to control said-inlet port.

Signedv at Philadelphia, county of Phila delphia,.Sta'te of Pennsylvania, this 24th'day' JAMES J. snirn,

is'like the form heretofore shown except'it is". provided with a lubricant passage- 30 f which is circular in cross section. V In this modification aflat strip spring 31 is mount ejd' upon a split cylinder 32 formed of spring 1 material which is arranged toJbe compressed 

